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Phosphorus Removal Via Phosphorus Removal Via Chemical Addition and Chemical Addition and
FiltrationFiltration
Waterborne EngineeringWaterborne Engineering
Colorado State UniversityColorado State University
AgendaAgenda
• Alternatives SummaryAlternatives Summary
• Decision AnalysisDecision Analysis
• Cost AnalysisCost Analysis
• Selected AlternativeSelected Alternative
• BioWin 3.1 ModelingBioWin 3.1 Modeling
• Summary/ConclusionSummary/Conclusion
• QuestionsQuestions
AlternativesAlternatives
• 2 Stage Chemical Addition2 Stage Chemical Addition
• Biological P Removal with Chemical Biological P Removal with Chemical AdditionAddition
• Tertiary Chemical Addition with Tertiary Chemical Addition with FiltrationFiltration
• Chemical Addition with Possible Chemical Addition with Possible Phosphoric Acid AdditionPhosphoric Acid Addition
Alternative 1 (2 Stage Alternative 1 (2 Stage Chemical Addition)Chemical Addition)
• Alum addition prior to final clarifier and prior to Alum addition prior to final clarifier and prior to filtersfilters
• Addition of chemical feed systems Addition of chemical feed systems
• Large increase in P rich sludge productionLarge increase in P rich sludge production
• Increased backwashing and maintenance on Increased backwashing and maintenance on filtersfilters
PrimaryClarifier
TricklingFilters
SolidsContact
AlumAddition
FinalClarifier
NTFs AlumAddition
DENITFilters
Disinfection
Alternative 2 (Biological P Alternative 2 (Biological P Removal with Chemical Removal with Chemical
Addition)Addition)
• Enhanced BPR with chemical addition for Enhanced BPR with chemical addition for polishingpolishing
• Addition of anaerobic tank creates an A/O process Addition of anaerobic tank creates an A/O process • May need to build additional tank May need to build additional tank • Chemical costs will be lowerChemical costs will be lower
PrimaryClarifier
TricklingFilters
SolidsContact
AnaerobicTank
FinalClarifier
NTFs AlumAddition
DENITFilters
Disinfection
Alternative 3 (Chemical Alternative 3 (Chemical Addition with Tertiary Addition with Tertiary
Filtration)Filtration)
• Chemical addition after DENIT filtersChemical addition after DENIT filters
• Addition of P removal filters Addition of P removal filters
• Does not affect biological processes of plantDoes not affect biological processes of plant
• Need to add chemical feed systemNeed to add chemical feed system
PrimaryClarifier
TricklingFilters
SolidsContact
FinalClarifier
NTFs AlumAddition
DENITFilters
DisinfectionDynaSand Filters
Alternative 4 (Chemical Addition Alternative 4 (Chemical Addition with Possible Phosphoric Acid with Possible Phosphoric Acid
Addition)Addition)
• Chemical addition prior to final clarifierChemical addition prior to final clarifier
• Addition of phosphoric acid prior to DENIT Addition of phosphoric acid prior to DENIT
• Need two chemical feed systems Need two chemical feed systems
• Large dose of coagulant prior to final clarifierLarge dose of coagulant prior to final clarifier
PrimaryClarifier
TricklingFilters
SolidsContact
FinalClarifier
NTFsAlumAddition
DENITFilters
DisinfectionPhosphoric Acid
Addition
Decision MatrixDecision Matrix
Decision Criteria and Decision Criteria and WeightsWeights
• Performance (100)Performance (100)
• Integration into Existing System (80) Integration into Existing System (80)
• Treatment Residuals (80)Treatment Residuals (80)
• Safety (80)Safety (80)
• Flexibility of Design (70)Flexibility of Design (70)
• Maintenance (70)Maintenance (70)
• Risk of Technology (60)Risk of Technology (60)
Alternative RatingsAlternative Ratings2 Stage Alum 2 Stage Alum
AdditionAdditionEnhanced Enhanced
BPRBPRAlum Addition Alum Addition with Filtrationwith Filtration
Alum and Alum and HH33POPO4 4 AdditionAddition
Performance Performance (100)(100) 9595 9090 100100 8080Integration Integration into Ex Sys into Ex Sys (80)(80)
5050 5555 7070 4545
Treatment Treatment Residuals (80)Residuals (80) 3535 6060 4040 4545Safety (80)Safety (80) 7070 8080 7575 6565Flex. Of Flex. Of Design (70)Design (70) 6565 5555 6060 4545Maintenance Maintenance (70)(70) 4040 6060 5050 6565Risk of Tech Risk of Tech (60)(60) 6060 4040 5555 3030
Scoring ResultsScoring Results
Sensitivity of ScoresSensitivity of Scores
• If % to crossover is less than 5%, then If % to crossover is less than 5%, then need to reassess model structure, weights, need to reassess model structure, weights, and scoresand scores
• Treatment Residuals: 5.5%Treatment Residuals: 5.5%• Integration into Existing System: 8.7%Integration into Existing System: 8.7%• Risk of Technology: 9.1%Risk of Technology: 9.1% • Maintenance: 10.6% Maintenance: 10.6% • Performance: 13.1% Performance: 13.1% • Safety: 18.5%Safety: 18.5%• Flexibility of Design: 33.5%Flexibility of Design: 33.5%
Life-Cycle Cost Analysis Life-Cycle Cost Analysis (LCCA)(LCCA)
• Evaluation of economic effects of Evaluation of economic effects of alternative designs and expressing alternative designs and expressing them in dollar amountsthem in dollar amounts
• Costs to analyze for each alternative: Costs to analyze for each alternative: – Initial: Purchase, Construction, Initial: Purchase, Construction,
EngineeringEngineering– Enduring: Operation, Maintenance, Enduring: Operation, Maintenance,
Energy, Chemicals, Sludge RemovalEnergy, Chemicals, Sludge Removal
Cost AnalysisCost AnalysisAlternativeAlternative Capital CostCapital Cost O & M CostO & M Cost ENG/Cont ENG/Cont
CostCost Total CostsTotal Costs
2 Stage 2 Stage Alum Alum
AdditionAddition $2.13M$2.13M $1.40M$1.40M $604K$604K $4.02M$4.02M
Enhanced Enhanced BPRBPR $8.61M$8.61M $682K$682K $2.48M$2.48M $11.8M$11.8M
Alum Alum Addition Addition
with with FiltrationFiltration
$6.01M$6.01M $902K$902K $1.80M$1.80M $8.71M$8.71M
Alum and Alum and HH33POPO4 4
AdditionAddition $2.01M$2.01M $1.53M$1.53M $604K$604K $4.14M$4.14M
In Depth Cost AnalysisIn Depth Cost AnalysisIn Depth CostsIn Depth Costs 2 Stage Alum Addition2 Stage Alum Addition Enhanced BPREnhanced BPR Alum Addition Alum Addition
with Filtrationwith FiltrationAlum and Alum and
HH33POPO4 4 AdditionAddition
ChemicalsChemicals $750K $750K $350K$350K $650K$650K $850K$850K
Feed and Storage Feed and Storage Facility:Facility: $763K$763K $381K$381K $381K$381K $763K$763K
Additional Feed Points:Additional Feed Points: $250K$250K $125K$125K $125K$125K $250K$250K
Energy:Energy: $101K$101K $430K$430K $300K$300K $101K$101K
Maintenance: Maintenance: $552K$552K $251K$251K $351K$351K $573K$573K
Additional Anaerobic Additional Anaerobic Tank:Tank: N/AN/A $7.0M$7.0M N/AN/A N/AN/A
Additional Filters:Additional Filters: N/AN/A N/AN/A $4.5M$4.5M N/AN/A
Recommended AlternativeRecommended Alternative
• Tertiary alum addition with filtration Tertiary alum addition with filtration
• Adding chemicals prior to biological Adding chemicals prior to biological processes may cause upsetsprocesses may cause upsets
• Parkson DynaSand Granular Media Parkson DynaSand Granular Media Filter (commonly used in WWTPs for Filter (commonly used in WWTPs for P removal)P removal)
DynaSand FilterDynaSand Filter
Alternative LocationAlternative Location
Alum Storage Facility
Alum Addition
DynaSand Filters
Alum Addition
P Removal
Filters
Design Using BioWin 3.1 Design Using BioWin 3.1 ModelingModeling
• Began model after denitrification Began model after denitrification
• Denitrification effluent P concentration of 2.70 Denitrification effluent P concentration of 2.70 mg/Lmg/L
• Able to optimize alum dose based on P removal Able to optimize alum dose based on P removal goalgoal
DENIT Effluent
Alum Addition
EffluentNull Bioreactor DynaSand Filters
Filter Sludge
Alum Dose and P RemovalAlum Dose and P Removal
Alum DoseAlum Dose Mass of Mass of Alum UsedAlum Used
Effluent P Effluent P Conc.Conc.
Annual Annual CostCost
150 mg/L150 mg/L 31,185 31,185 lbs/daylbs/day 0.04 mg/L0.04 mg/L $569,000$569,000
109 mg/L109 mg/L 22,261 22,261 lbs/daylbs/day 0.13 mg/L0.13 mg/L $414,000$414,000
65 mg/L65 mg/L 13,514 13,514 lbs/daylbs/day 0.70 mg/L0.70 mg/L $247,000$247,000
SummarySummary
• Tertiary alum addition with filtration Tertiary alum addition with filtration
• Does not disrupt nitrification/denitrification Does not disrupt nitrification/denitrification processesprocesses
• Allows for flexibility in P removal Allows for flexibility in P removal
• Used by numerous WWTPs throughout the Used by numerous WWTPs throughout the US with excellent resultsUS with excellent results
Questions?Questions?